CCL27 and asthma: Due to the imbalance of age between HC and patients with asthma, we firstly checked the relationship between age and ILC subsets and found a negative correlation with ILC3 (r = − 0.29, P = 0.067) and positive correlation with ILC2 (r = 0.35, P = 0.023) but not ILC1(Fig. 1B).